117 lines
2.3 KiB
C
117 lines
2.3 KiB
C
#include "assert.h"
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#include "stdio.h"
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#include "string.h"
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#include "process.h"
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#include "protect.h"
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#include "type.h"
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#include "trap.h"
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#include "x86.h"
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#include "time.h"
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#include "keyboard.h"
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#include "game.h"
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/*
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* 三个测试函数，用户进程的执行流
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*/
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void TestA()
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{
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int i = 0;
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u8 ch;
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while(1){
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if ((ch = getch()) != 255) {
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kprintf("%c", ch);
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}
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// kprintf("A%d.",i++);
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for (int j = 0 ; j < 5e7 ; j++)
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;//do nothing
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}
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}
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void TestB()
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{
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int i = 0;
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while(1){
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// kprintf("B%d.",i++);
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for (int j = 0 ; j < 5e7 ; j++)
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;//do nothing
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}
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}
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void TestC()
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{
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int i = 0;
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while(1){
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// kprintf("C%d.",i++);
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for (int j = 0 ; j < 5e7 ; j++)
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;//do nothing
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}
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}
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// 每个栈空间有4kb大
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#define STACK_PREPROCESS 0x1000
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#define STACK_TOTSIZE STACK_PREPROCESS * PCB_SIZE
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// 用户栈（直接在内核开一个临时数组充当）
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char process_stack[STACK_TOTSIZE];
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// 指向当前进程pcb的指针
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PROCESS *p_proc_ready;
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// pcb表
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PROCESS proc_table[PCB_SIZE];
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#ifdef HAPPY_SNAKE
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void (*entry[]) = {
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startGame
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};
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char pcb_name[][16] = {
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"SNAKE"
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};
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#else
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void (*entry[]) = {
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TestA,
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TestB,
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TestC,
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};
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char pcb_name[][16] = {
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"TestA",
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"TestB",
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"TestC",
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};
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#endif
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/*
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* 内核的main函数
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* 用于初始化用户进程，然后将执行流交给用户进程
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*/
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void kernel_main()
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{
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kprintf("---start kernel main---\n");
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PROCESS *p_proc = proc_table;
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char *p_stack = process_stack;
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for (int i = 0 ; i < PCB_SIZE ; i++, p_proc++) {
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strcpy(p_proc->p_name, pcb_name[i]);
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p_proc->regs.cs = (SELECTOR_FLAT_C & SA_RPL_MASK & SA_TI_MASK)
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| SA_TIL | RPL_USER;
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p_proc->regs.ds = (SELECTOR_FLAT_RW & SA_RPL_MASK & SA_TI_MASK)
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| SA_TIL | RPL_USER;
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p_proc->regs.es = (SELECTOR_FLAT_RW & SA_RPL_MASK & SA_TI_MASK)
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| SA_TIL | RPL_USER;
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p_proc->regs.fs = (SELECTOR_FLAT_RW & SA_RPL_MASK & SA_TI_MASK)
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| SA_TIL | RPL_USER;
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p_proc->regs.ss = (SELECTOR_FLAT_RW & SA_RPL_MASK & SA_TI_MASK)
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| SA_TIL | RPL_USER;
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p_proc->regs.gs = (SELECTOR_VIDEO & SA_RPL_MASK & SA_TI_MASK)
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| RPL_USER;
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p_proc->regs.eip = (u32)entry[i];
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p_stack += STACK_PREPROCESS;
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p_proc->regs.esp = (u32)p_stack;
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p_proc->regs.eflags = 0x1202; /* IF=1, IOPL=1 */
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}
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p_proc_ready = proc_table;
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change_8253Counter0(1000);
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enable_irq(CLOCK_IRQ);
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enable_irq(KEYBOARD_IRQ);
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restart();
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assert(0);
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} |